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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8d2bc114ba83c9ec8c24024f0b4e4b8dd0762b191f3f238e47d896e9aac91b' 
  AND token = 'XJuNtZvFlEs4+AGt5npvfGSKsmuyJ56u1Oi56Ueuy4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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