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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da9f21b2d7eef1dc3c416f5f55756acf961f8d69109cd9b516afe324c39f572' 
  AND token = 'Qv2cSQnUAfPXh/zLLHD871fprXcz5E5LSDU68K3pHGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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