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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d2f2396dd9b7cf9ab2e0db79c88d8079c357c36148d988855ab37fbeb52bd9' 
  AND token = '8B3FpJjqQM4q/CycaEsUaXLIHl7qg3HPG1AE5dj+WV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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