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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d31ec79add02b0cbbd2e9e069af1a52bbae1a0047ce28307f2eef65ba7b57cc' 
  AND token = 'JA42zV7s2yOVSfNm5NnVSYGntkrclSnmAw/YFqBmMvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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