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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2766dae1ccca1ed1ca3650738f1e66907a8b3e2dee68c8689bf16798c9bff7' 
  AND token = 'b76SqNASvKK3trv6NNhv/uFUAyR/GjPFr5F1cIwZop4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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