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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9a97fdc44428751dc6f2ff922a9990d523359ee47f8cdf63fe9e05e0fd0ca9' 
  AND token = 'UCW8SwH2OaBYwaA6h5dcZ3ZR6f8uHi9AC94gdbsGlxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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