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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee46466b59ab2db0827c08b21719bf7c851f7c79cb5eb2966ef9d67d2ae703fc' 
  AND token = 'ZRWyuMOARHl/W4kk4LwvZe3+FZaSNQS7GSV0WQCJlsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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