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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51016596f1ef1e5c2a6c670f8068f014e9764d06a6a5ce46974bb322ebc59cd' 
  AND token = 'of1f95/I+RXETCHksydU5Ig1c/S+a2Cl9GrlaGeGPLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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