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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcdbd61d2c284a2319d45a0c38db3fcb3ad16afb8ad0ebef1b0ef319f28eb2b8' 
  AND token = 'jmnbFBpzd5VAScrMRNtLlwqPYRtbuOU0D+FUNzevsgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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