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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd65814e9086fe975754875ea9efd5ad241657ab212eb01bf3a022b5caf9056' 
  AND token = 'DCb7a5/8IYxyQPfOcTvQxeNAubnEAtfDo//Vi0YogfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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