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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '261b7fa4e19b385a373705e2507d9c0a4e189499f5e884634f98639f87c1511e' 
  AND token = '7/qVwHqs40cOJqtvoCWInpqHds99lsdUl5zlCrMNdhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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