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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ff20b159d68d644c60db0988ca5b7c885d4bc973ffc410fd3f47596ed586d7' 
  AND token = 'C1bHetz6Zm9G37wLI7irXeBWG60V8yL5v169z9CpuDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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