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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02037a507e7cbf85d61bf9d4eaba14f973e74d1152e44237cc8ddf6526b5b51' 
  AND token = 'N3o3ylmnY34/p+QIfjjz6y3+HA0Yxj+RdMUKiM5BLBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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