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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7027eec2eb95abf0ac789fd880f093c0ca894948d1506b1584d243b0d99687d3' 
  AND token = 'HqzNhDZjD58pldJLtjPTW0Qus1bdyhyW8AmpsFAS8Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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