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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a7b1da12051b2b3657478133b66ace0e0a3c5d64d2c2bf7e718111179fc0c7' 
  AND token = 'Lc5++4EzLMTluJc73kuwKmTXH8ZZyj2SC/OFRnDhJyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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