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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a53b6de5745e6b774db9e983bdf33bbbe30d8fe595506bff341aed1f6c2e44' 
  AND token = 'HjE7WAH7VgRTZDSnF4UQ30dKrl3lRZ3JdvO0ytQ3Yaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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