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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f336ca1779795eba46318c7c0c08142a19b88436bd72e24c43efef8cf0f1c99' 
  AND token = 'Epv/lUUn6xC3KVpIjbfrC7gH3SUBjr3McXMf0lFEQ8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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