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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d90ec778c3d8cdec97a08882376a784c9d5f8ff4c6883070cf513428dea2a9' 
  AND token = 'RysgRnSJgnsjePmFN2zUF+sc+bqoJXfBQMSwXbk5YIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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