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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c6c57044304f58a40e0af1ad93366faacdfa0fbcb402f1c493244e6d1b9b6e' 
  AND token = '3yL4wSbp4iV2vF62dTH8mH8qBcnYUfdk2y3NO3aywaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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