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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4140d00712b1494bf5d3a6138ff54074eb65a54d4db57e346de8bda369da81c3' 
  AND token = 'OFnreBa0b+E6+nEJnuXtVMXKB0tATpd7QuTHxs3it50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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