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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61895d58ff16cb6542a6b5c5383daade467ffbc98068a5d8bc9ad14b4ba6a1da' 
  AND token = 'gwsJcZG16TGxg/5xZW+zR9HSQz9Atg8hwU4AdgCLI68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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