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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2122715eb1dc8962385c499058c00f95a7b063ea42343b33d80c8d3ad1955022' 
  AND token = '2BkfC5gkCtOwtmHdd6hSz/mM976TB/QsRIJ3I/ZSOpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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