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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7376ed2995c342a697e82936087ad11fa47ad3f1937103e4fc3abd87762a1acf' 
  AND token = '2lhVC+Q4y+aP7bVLcoHm9GCzagh9sjTSIlkp7F8+JjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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