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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77e85b99e31c4d96a7789e006012051f9dd7e1df66209f699ab85967094b3f5' 
  AND token = '4rUfZvi8gyDsgsVFrPF4iXZMbDeu4RKG7i91R1sgW90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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