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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad94dc90db987b7a23e7c5a1adde4b4ced7ed5652c249d41a19a5ffce4294e7' 
  AND token = 'pozARAcBlZANZ2n5zl1dTg+vqwoW1DqARbxwRJizMz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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