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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab51e8a78784054d179a8ccf51a0fae6ecf950038df9bae095ee2b60313a452' 
  AND token = 'ymbJkRVTdOf8JRZpcoLcDbe84M3pde+8q1upZ4ILwnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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