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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596b6ed20202fac73ff989912442a7bb44ab3ae2873cf24f36d3261a7a3320c0' 
  AND token = '0TykoAPeQ4lmCmLud8nuWuX3m32ouhp0cJefei17v+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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