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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fda35438acb6cf3e7f4059ca3f71cf860523daa38819ef470d35a03496b48a2' 
  AND token = 'M+H42p16UT2bnyoD6AgAP6YNY5gp4u95mXgi7dIDwEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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