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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba091f7522f1948ceeb2b42a2ad0dc854dd1ea22dca8c5c10de2f8c9150d944' 
  AND token = '/1e7pMiK+GeSKINUUlfYsq791yzuSeoMPR26MC7wmt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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