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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2d09a798fbeb625840c8fed08f59af0e42007195fd2c07b8bf209d767b4271' 
  AND token = 's7++Ch5wQyhEhwrjRKYu6zWA0wT2wDdROmWDoQL4bgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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