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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94201b74eb413bb19d815a338b4a87510e1a7c5884798520c85e8a51d6e1ee8' 
  AND token = '3vGpyOUPzelSCXkKcXD/z5/vICYC7hwMwSoE4yvWrBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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