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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb13b58f0efd045523c8934ae3e1e41cc0da77115d2648b78227cd7e285a23b' 
  AND token = '2ZtoVy2SQ1AZpRdzfX0AXksUed1nnrImnT2Qz3EUue0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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