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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e675b58f090aa5bc71fcf8110ce3b084435707d225cd632b74855d43ba7db81a' 
  AND token = 'BqmrsuJyFd1azX7JjfeyFILJno2UPvmm1+06BPP3928=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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