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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16fdc2ef94b34cc6390d9ca19ecaefc0a82d62906b3f6b5013073c68362be19d' 
  AND token = 'BnjMYfjKP9ZziWkG02ImLzTs9SYH0o8X27NTfb5C8Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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