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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef029c896b809a51d7c9995be49707dc80af0335a33a20cdd5614a35ea3caf0f' 
  AND token = 'GLr4ZMxsW19lZgc4BlQ6FpcGA/zwcPpEHlu5+cYb5f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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