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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc4ee2c20d455677ae63dab743f74adc3bcf67f19f998768cefcebce3a05c42' 
  AND token = 'oeYR1l2EZP4cyM2kk5PEuwp/YEBVmTjooH/g7CrZiZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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