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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f0d3124c9daae853547e4183f95511d8d9a0a9cd67efdf8ffc6c1afc3b9956' 
  AND token = 'bte4L4k7+8yMjZBu5NhX7C90qjtxM+UuSOb0bleUZNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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