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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e4ec7ba3691f357a9cf6f42554bbc94d0d3ca94828e0898d8e95e931effe14' 
  AND token = '0IBcn7O/tbvJcKbwnkETYxyEZs4uweLosoMBpuZDbGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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