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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c29fa4b1865e08fe14f7779d073d4fba71ea0e3230bba8b966248a9c59955a5' 
  AND token = 'WHecjFNtheH1/RmDwRjyou8Ggg6AYNCbimqGAzP0Ix8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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