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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5214199a87771a6a9d2881927f4354be9ea8a03189abf1f69bb543d77c064d8' 
  AND token = 'hqtskuBekbaENSXoBpCfG2rTVXYy3OTDzQqgOcl0Yz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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