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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069afbc075c86b975cf34bcfeb9f5fea5381304feec67b5c1e55acf6bd89d4a7' 
  AND token = 'j4VVodSTBQlxBia2FDTjlDEwHql4YzzZ4C3re10R/JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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