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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3786927b3abee3d95cbbc527f3016d59e437121d732ae145f941b32fd25dd6a5' 
  AND token = 'BY8AdANjQE3AbrtTevl5P2otIYU3Le/5E4bTetfSv+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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