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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317063b8621f446828e7d5968a5246cee137cb93bb37bf0a681b78c60f0e96cf' 
  AND token = '6/4tIt3iUd3DJqBS3r5DyVjQT/fTokp0PgrC7FoiuF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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