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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd8ab98c8a1707ca375381e4421ca8f53420832db85ad899ed85cb318104636' 
  AND token = '015ZaPmwB1WTQC9PIf22pQByK/Yv1sRXazTNTRxM39Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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