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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37693a7e86acbb28ed213bdb7e3e377a5f80855d3425ab1949962975169de7df' 
  AND token = 'Ac0m6hPO8jsno4y7wCUBWGjGwN3I7zeXktkGtE9Beb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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