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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536ff79361474e22714ff646930d2204528f4966b48e818713904abb172ad123' 
  AND token = 'Xx8U20zTO4qsRLP+kqDFBjjHssIOR7YlB5L9dA47Z4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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