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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc895087d986e6edcba70b1ba0ec01010cae57c22e181fe0ff960175d0a99a9' 
  AND token = 'IiD+IP3oIXf1z8NWaccD99fUpnj+a/PEtyRdrZTWj5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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