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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fd07e827698cd042a198afab630fbd227f7fb0b4e336f860ffb1687ea9973b8' 
  AND token = 'sGhMKOs7uI2O4+dn/ueW6LFHnTApaqGA0VI7tqGNyYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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