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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca9ba5671a59ca76e458ccb7d2eb6a6b8d3176ec52f51db0863608e9795254d' 
  AND token = 'rvLfoFUSBmKR3CSGcBGBEXu1/VynCQ14szW3XQ6e4hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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