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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b7c7258b12d62b8c9b71807d9ef6bacecbdcd7293bf82c4664b7517ae25dfe' 
  AND token = 'lceuiSX19Z7z/Rn+BF+6yE5ZSnNZsiGACrQZwiVw1hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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