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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff30dd340ede8e568a359a3d8d51f9a9ae60c42598328c8b90c6fae57acf2ec5' 
  AND token = 'B+/i+K3GHNXavz7SH6cNWVqfGsMnpdmd5qTzDOIyeUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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