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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29ed585f904adc552db7076c6c67cabd64009ae43fb3ed4a0c6bf38ea259a51' 
  AND token = 'g9wlm+FGF5qiAoV7uYjlL1fF0oHC1y3Fka4e5F3K2NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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