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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf9c2f6577dbacc2d2b4ea0fbd6ffd2214d0e36cb80f0d39c66025eab7385a2f' 
  AND token = '1jLmvdbILHZEGEZNvsyC/0+sXiSkz/z0PJOncxbGOQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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