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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e25ebe42f8204761785edc25b7ec73c7d97162d26ce01ecd9929c0c498818b12' 
  AND token = 'wSwmahPBiCUgauv3I1cMz4NYnLtKdy9AFjPOOfg2SAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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