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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c677cf1d9b45b8125e1612edcf634a04cec797afad6555f1a51a8040674d72' 
  AND token = '3SaslQY391etMupklYqFw/7J6mS+Krdue5qI/j67EA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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