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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc74cb261adf7a0365f2762b4877ae47496e54488c19b2f818a777eb9162f39' 
  AND token = '1s7VwR5jIlz+7MFb7NnI2wVosZsGBg8M2a1HntnhZvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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