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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aaa464adca049e0149aec3cf2562f6c060f1ef608d9d44b47937ac4ac611b7c' 
  AND token = 'W3edRwUm0SEBylds/3pLAEb5uLnq+MeGMPUNi2I3PBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}