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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3dab2f8430e7839ad75ab14e5baa48ff38dcca0befe301f1f26ad98ad3fa4b' 
  AND token = 'uMZEDHMHWYto1G2vY+FOqI9V9YGsfejV+n4o6mTahsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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