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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3e713b21ff7ca3abfde628dbea2167d65282d5466551adf8546c2984b6e82a' 
  AND token = '1FOVIfXZ07ps0GP8U24rgHl6F44haUlhDqEpFqO6ju8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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