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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe00d7930c4474841cf4e1731843ed276c8f251c84dbc9d94f9dcc3a2295609' 
  AND token = 'ksR+cDczSv+EN8RHCgvqpTdL7wPJqlse04QCAxC1vig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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