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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77787e2599093d363104fe003bc646b60bf2300f53c201d1abe10b9d1ba938d8' 
  AND token = 'SLyk94tf9AuWnkuuosYlPTPxDzBOHNi2VF3LFVA1aUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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